package com.lagou.dao.impl;

import com.lagou.dao.CourseDao;
import com.lagou.pojo.Course;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class CourseDaoImpl  implements CourseDao {

    /**
     * 查询课程列表信息 （查询数据库中的内容）
     * @return
     */
    @Override
    public List<Course> findCourseList() {

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "SELECT id,course_name,price,sort_num,STATUS FROM course where is_del =?";

            //3.执行查询

            List<Course> courseList = qr.query(sql, new BeanListHandler<Course>(Course.class), 0);

            return courseList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }


    }

    /**
     *   根据课程名称 和状态 查询课程信息
     * @param courseName
     * @param status
     * @return
     */
    @Override
    public List<Course> findByCourseNameAndStatus(String courseName, String status) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL 当前的查询为多条件不定项查询
            //2.1 创建StringBuffer 对象,将SQL字符串 添加进缓冲区
            StringBuffer sb = new StringBuffer("SELECT id,course_name,price,sort_num,STATUS FROM course WHERE 1=1 and is_del = ? ");

            //2.2 创建list集合 保存参数
            List<Object> list = new ArrayList<>();
            list.add(0);

            //2.3 判断传入的参数是否为空

            if(courseName != null && courseName != ""){
                sb.append(" AND course_name LIKE ?");
                //like查询 需要拼接 %
                courseName = "%"+courseName+"%";
                //将条件放进list集合
                list.add(courseName);
            }
            if(status != null && status != ""){
                sb.append("AND STATUS = ?");
                //将status 转换为 int
                int i = Integer.parseInt(status);
                list.add(i);
            }
            //3.执行查询
            List<Course> courseList = qr.query(sb.toString(), new BeanListHandler<Course>(Course.class), list.toArray());
            //返回结果
            return courseList;  //返回查询结果
        } catch (SQLException e) {
            e.printStackTrace();
                return null;
        }

    }

    /**
     * 新建课程，逐条插入课程信息   	//保存课程营销信息
     * @param course
     * @return
     */
    @Override
    public int saveCourseSalesInfo(Course course) {
        try {
            //1、获取连接
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            //2、编写sql语句
            String sql ="INSERT INTO course(\n" +
                    "course_name,\n" +
                    "brief,\n" +
                    "teacher_name,\n" +
                    "teacher_info,\n" +
                    "preview_first_field,\n" +
                    "preview_second_field,\n" +
                    "discounts,\n" +
                    "price,\n" +
                    "price_tag,\n" +
                    "share_image_title,\n" +
                    "share_title,\n" +
                    "share_description,\n" +
                    "course_description,\n" +
                    "course_img_url,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time\n" +
                    ")VALUE(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
            //3、传入参数
            Object[] param = {
                course.getCourse_name(),course.getBrief(),course.getTeacher_name(),course.getTeacher_info(),
                course.getPreview_first_field(),course.getPreview_second_field(),course.getDiscounts(),course.getPrice(),
                course.getPrice_tag(),course.getShare_image_title(),course.getShare_title(),course.getShare_description(),
                course.getCourse_description(),course.getCourse_img_url(),course.getStatus(),course.getCreate_time(),course.getUpdate_time()
            };
            //4、执行插入操作、返回结果
            int row = qr.update(sql, param);
            return row;  //返回受影响的行数
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * //根据课程ID 查询课程营销信息  (先查询  给用户一个回显信息)
     * @param id
     * @return
     */
    @Override
    public Course findCourseById(int id) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "SELECT \n" +
                    "id,\n" +
                    "course_name,\n" +
                    "brief,\n" +
                    "teacher_name,\n" +
                    "teacher_info,\n" +
                    "preview_first_field,\n" +
                    "preview_second_field,\n" +
                    "discounts,\n" +
                    "price,\n" +
                    "price_tag,\n" +
                    "course_img_url,\n" +
                    "share_image_title,\n" +
                    "share_title,\n" +
                    "share_description,\n" +
                    "course_description,\n" +
                    "STATUS\n" +
                    "FROM course WHERE id = ?;";

            //执行查询操作
            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), id);
            return course;  //返回查询后的结果级对象course


        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     *  //修改课程营销信息 (用户看到回显信息后，进行课程信息的修改)
     * @param course
     * @return
     */
    @Override
    public int updateCourseSalesInfo(Course course) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql="UPDATE course SET \n" +
                    "course_name = ?,\n" +
                    "brief = ?,\n" +
                    "teacher_name = ?,\n" +
                    "teacher_info = ?,\n" +
                    "preview_first_field = ?,\n" +
                    "preview_second_field = ?,\n" +
                    "discounts = ?,\n" +
                    "price = ?,\n" +
                    "price_tag = ?,\n" +
                    "share_image_title = ?,\n" +
                    "share_title = ?,\n" +
                    "share_description = ?,\n" +
                    "course_description = ?,\n" +
                    "course_img_url = ?,\n" +
                    "update_time = ? \n" +
                    "WHERE id = ?";

            //设置修改课程信息
            Object[] param ={
                course.getCourse_name(),course.getBrief(),course.getTeacher_name(),course.getTeacher_info(),
                course.getPreview_first_field(),course.getPreview_second_field(),course.getDiscounts(),
                    course.getPrice(), course.getPrice_tag(),
                course.getShare_image_title(),course.getShare_title(),course.getShare_description(),
                course.getCourse_description(),course.getCourse_img_url(),course.getUpdate_time(),course.getId()
            };

            int row = qr.update(sql, param); //返回受影响的行数
            return row;

        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }

    }

    /**
     * 修改课程状态
     * @param course
     * @return
     */
    @Override
    public int updateCourseStatus(Course course) {

        try {
            QueryRunner qr =new QueryRunner(DruidUtils.getDataSource());

            //编写sql修改数据
            String sql ="UPDATE course SET STATUS = ? ,update_time = ? WHERE id = ?";
            //设置参数
            Object[] param = {course.getStatus(),course.getUpdate_time(),course.getId()};

            //执行sql语句 返回受影响的行数
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
